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In order to determine the number of students surveyed, we will count the number of students in each sub-group.
Students that did not engage: 279
All three behaviours: 90
113 smoked cigrarettes and used illegal drugs:
Answer:

Step-by-step explanation:
Let the points be A and B
A ( -13 , 15 ) ⇒( x₁ , y₁ )
B ( 20 , -7 )⇒( x₂ , y₂ )
<u>Finding</u><u> </u><u>the</u><u> </u><u>slope</u><u> </u> :

plug the values
⇒
We know that, 
⇒
Calculate the sum
⇒
Reduce the numbers with G.C.F 11
⇒
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Answer:
Solution given:
total female [T]=3+4+6+3=16
n[senior female]=3.
probability the student is a senior given that it's
female:![\frac{n[senior female]}{total [T]}](https://tex.z-dn.net/?f=%20%5Cfrac%7Bn%5Bsenior%20female%5D%7D%7Btotal%20%5BT%5D%7D%20)
:
:
is a probability.
Now percentage::
=18.75=19%